I'm trying to share the root of the Sheevaplug file system via Samba so that I can mount it from a Windows computer. I can view all the files from the remote Windows machine, but all attempts to write fail. The share I've defined in smb.conf looks like this:

Even if I select "Map network drive" from file explorer on Windows, and enter the root credentials, I still can't write to the share (but I can still read everything on it). Has anyone gotten something like this working?